AB-300/CW-294-UN 40' Antenna Mast Kit. Includes eight self locking to prevent rotation 66"LX1.6"Dia aluminum AB-300 mast sections to make a 40' mast. Five GP-111 18" Guy Stakes. These mast kits are VERY well made and great for quick, expedient antenna setups. Great for Emergency Portable setups including field day or even a small back yard where towers are not an option! Sections lock together to prevent rotation so they can be used with a small beam. Used,